In the configuration of your code sample, you should make following changes:

The configuration message must be sent before creating the part, else the configuration is not applied to the new part. So you must move your configuration block code before your contentpart block code.

In your configuration json there is a small mistake on the language key name: it must be "lang" (not "language"). So in your code the line "\"language\":\"zh_CN\",\n"+must be replaced by"\"lang\":\"zh_CN\",\n" +